used the regular black iron ,yellow coating 21' length. also needed some 10s
so used h .depot green. inspector signed off, but never seen these green ones. the yellow has a heavier jacket. any comments?

the green is rated and is just as good. It is actually easier to use as you don't have to strip the coating to thread. make sure you wrap the pipe anywhere the coating gets compromised. Once you damage the coating on the x-tru (yellow wrapped) it will rust through rather quickly (depending on soil conditions).

My comment is that the green Scotchcoat is just about useless in the long run, unless the entire length is either tape wrapped or enclosed in a plastic sleeve. It will rust through rather quickly anywhere the "paint" is damaged, and it can be damaged somewhat easily. I have seen sections that were only a few years old that looked like swiss cheese they had so many holes in it.

the coating on the x-tru can be damaged just as easily. Have had problems with it rusting through rather quicky after getting hit with a shovel. It doesn't matter what pipe you use, it the coating gets damaged and not repaired it will rust through rather quickly depending on soil conditions. The coating on the "green" pipe isn't painted on. It is an epoxy that is baked on, a huge difference.

quote; The coating on the "green" pipe isn't painted on. It is an epoxy that is baked on, a huge difference.

I used the term paint loosely since the material is applied TO the pipe and regardless of how it is applied it still chips off and exposes the pipe material. This might not be a serious problem if the underlying pipe were galvanized, but since it is black pipe it deteriorates very quickly in an underground situation.

All the propane companies will run the poly on a tank set quite cheaply.

Always hated the black coated gas line because the crappy wrap tape for joints is so stiff that it cannot seal properly. It should be 2 mil with 10 wraps. Then I would coat it with a good asphalt sealer or silicone [if you can get asphalt anymore- all the CA stuff is crap water base]. That entire system is a primitive joke.

If anyone really cared or wanted to think and MFG. it, one would slip on a section of shrink tube over joints and turns and heat it up.